Randy Barnett examines an essay looking into how we justify wars. I like the thrust of this because it clears away quibbles about legal justification to the moral justification. Bears read in its entirity. Money quote:

Again, this is not to suggest the ends justify the means, but rather to acknowledge that there are always deeper reasons to go to war than what lawyers, diplomats, and politicians profess. Those underlying factors are ultimately judged as moral or immoral by history's unforgiving logic of how, and for what reason, the war was waged -- and what were its ultimate results. We live in a sick, sick West if we investigate Mr. Bush's and Mr. Blair's courageous efforts to end Iraqi fascism, while ignoring the thousands of Europeans and multinational corporations who profited from his reign of terror.

Postmortem. If the United States went to war with Iraq only because of the threat of WMDs; if the mass murdering of Saddam Hussein was found on examination to be highly exaggerated; if we had some secret plan for stealing the oil of Iraq, if Saddam Hussein posed no future threat to the United States or its allies; if the war resulted in a worse future for Iraq, the United States, and the surrounding Middle East; and if the administration deliberately constructed false intelligence evidence to advance such an unnecessary war that resulted in misery rather than hope, then an apology is needed now. But so far, that has simply not been the case.